Printable Hard Sudoku

Set 123nuqo. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
4 8
3 7 5 4
4 6 3 2 7 9 5
6
3 1 2 8
7 6 5 3
6 8 7 2
2 3
1
Hard #2
8 6 9
2 4 9 1 7 8
1 2 3
4 6 1
9
1 2 7 9
9 5 6
4 5 2
6 1 4
Hard #3
8 7 1
7 3 5
2 6 9
6 5 7 3
4 9
9 1 2
8 3 7 1 9
6 4 2 8
3 4
Hard #4
4 2
3 6
2 5 8 3
8 4 7 2
7 5 4 2 9
1 5 3 7
2
5 8 7 3
1 3 6
Hard #5
7 3
7 1 5
3 2 7 9 6 8
4 2 6
5 8 9 7
6 8 9
3 9 1
8 7 1 2
8
Hard #6
5 8 3 9
4 7 2 9 6
9 7 1
7
8 5 9 4 3
9 5 2 1
6 2 8 7 3
4
6
Hard #7
8 7 6
6 8 2 9
7 4
1
6 3 4 7
3 4
4 3 2
8 6 3 7 4
6 2 5 7 1
Hard #8
2 6 5
3 2 9 7
9 1 4 6 2
6 8 9 4 5
5 6
7 9 4
4 2 7 3
8 9
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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